Shunka doesn't feel like it was nerfed very much. I ran back in as a Br/Hu, with no braver stances (forgot to change after seeing Shunka still has 2700+ power) and I'm not hitting much less than I remember. Less than the 20% I should be losing from not having average, but yeah. On a side note...
Wow, Asagiri is useful again, besides dashing, awesome!
Gekka is not the best dps PA out. I'm going all in on this one. Set it to your 2nd PA on katana, shorthop, attack, use Gekka, rinse and repeat. For 20 cost and being able to get off so many in a short time frame, I am definitely using this from now on. Also have Hatou Rindo in 3rd, which when you land you can instantly just attack into that, so cool. Also, I say short hop it since if you do it from from ground, you have to do a full jumping animation, which kinda sucks.

They changed the way Asagiri and Shunka power are displayed, so it's hard to calculate exactly how much it was nerfed, but I think Shunka got kicked by about 30% and Asagiri got a buff of about 25% (estimating from previous numbers considering each to be previous power listing to be per-hit modifier). Neither of these are enough, so I suspect Asagiri will continue to be unused and Shunka will still be the go-to damage ability (since it was so vastly ahead of everything else in the first place).

They changed the way Asagiri and Shunka power are displayed, so it's hard to calculate exactly how much it was nerfed, but I think Shunka got kicked by about 30% and Asagiri got a buff of about 25% (estimating from previous numbers considering each to be previous power listing to be per-hit modifier). Neither of these are enough, so I suspect Asagiri will continue to be unused and Shunka will still be the go-to damage ability (since it was so vastly ahead of everything else in the first place).

Plenty of people using Asagiri in the new gentei quest. But, probably just trying it out.